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13478421 = 311408437
BaseRepresentation
bin110011011010…
…101000010101
3221100202220210
4303122220111
511422302141
61200520033
7222364455
oct63325025
927322823
1013478421
1176765a0
124620019
132a3bbc8
141b0bd65
1512b3916
hexcdaa15

13478421 has 8 divisors (see below), whose sum is σ = 19605024. Its totient is φ = 8168720.

The previous prime is 13478401. The next prime is 13478431. The reversal of 13478421 is 12487431.

13478421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13478421 - 25 = 13478389 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13478401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204186 + ... + 204251.

It is an arithmetic number, because the mean of its divisors is an integer number (2450628).

Almost surely, 213478421 is an apocalyptic number.

13478421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13478421 is a deficient number, since it is larger than the sum of its proper divisors (6126603).

13478421 is a wasteful number, since it uses less digits than its factorization.

13478421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408451.

The product of its digits is 5376, while the sum is 30.

The square root of 13478421 is about 3671.2969098127. The cubic root of 13478421 is about 237.9832215180.

The spelling of 13478421 in words is "thirteen million, four hundred seventy-eight thousand, four hundred twenty-one".

Divisors: 1 3 11 33 408437 1225311 4492807 13478421